Multisite Test/Staging Environment

Hello there, i've an important but not deadly urgent issue.
I'm using as a wordpress network with domain mapping plugin which has 6 sites on it. I'd like to create a Test/Staging Environment for it on Then i made a bit research and found articles about using wmmu for staging but they are all about single sites. But i'm using different themes, plugins and settings on whole network so i need to clone and sync whole network. Any ideas or guides?
Thanks and Kind Regards